@article{Sun2017, author = "Sun, Guang-Zhen", title = "{Exploiting Gossen's second law: a simple proof of the Euler equation and the maximum principle}", year = "2017", month = "11", url = "https://bridges.monash.edu/articles/journal_contribution/Exploiting_Gossen_s_second_law_a_simple_proof_of_the_Euler_equation_and_the_maximum_principle/5562310", doi = "10.4225/03/59fab5b326d48" }